A study on the electrochemical characteristics of LiFePO4 cathode for lithium polymer batteries by hydrothermal method

作者：Jin En Mei; Jin Bo; Jun Dae Kyoo; Park Kyung Hee; Gu Hal Bon^*; Kim Ki Won

来源：Journal of Power Sources, 2008, 178(2): 801-806.

DOI：10.1016/j.jpowsour.2007.09.073

• LiFePO4
• carbon black
• hydrothermal method
• solid polymer electrolyte

Phospho-olivine LiFePO4 cathode materials were prepared by hydrothermal reaction at 150 degrees C. Carbon black was added to enhance the electrical conductivity of LiFePO4. LiFePO4-C powders (0, 3, 5 and 10 wt.%) were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). LiFePO4-C/solid polymer electrolyte (SPE)/Li cells were characterized electrochemically by charge/discharge experiments at a constant current density of 0.1 mA cm(-2) in a range between 2.5 and 4.3 V vs. Li/Li+, cyclic voltammetry (CV) and ac impedance spectroscopy. The results showed that initial discharge capacity of LiFePO4 was 104 mAh g(-1). The discharge capacity of LiFePO4-C/SPE/Li cell with 5 wt.% carbon black was 128 mAh g(-1) at the first cycle and 127 mAh g(-1) after 30 cycles, respectively. It was demonstrated that cycling performance of LiFePO4-C/SPE/Li cells was better than that of LiFePO4/SPE/Li cells.

• 出版日期2008-4-1
• 单位吉林大学